CVE-2026-21727: A cross-tenant isolation vulnerability was found in Grafana’s Correlations feature affecting legacy correlatio

Routine

LOW 3.3UPGRADE

CVE-2026-21727 is a low-severity flaw (CVSS 3.3) affecting grafana. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-tenant isolation vulnerability was found in Grafana’s Correlations feature affecting legacy correlation records. Due to a backward compatibility condition allowing org_id = 0 records to be returned across organizations, a user with datasource management privileges could read and permanently delete legacy correlation data belonging to another organization. This issue affects correlations created prior to Grafana 10.2 and is fixed in >=11.6

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-732
Published	2026-04-15
Last modified	2026-10-26

Publisher (CNA): Grafana Labs · Vendor: grafana

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-15 20:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

grafana grafana UPGRADE

Affected: < 11.6.11 · >= 12.0.0 and < 12.0.9 · >= 12.1.0 and < 12.1.6 · >= 12.2.0 and < 12.2.4 · >= 12.3.0 and < 12.3.3

Fixed in: 11.6.11, 12.0.9, 12.1.6, 12.2.4, 12.3.3

Safe to downgrade to: a release before 12.0.0

1. Check installed version

apt-cache policy grafana || rpm -q grafana || grafana --version

2. UPGRADE to 11.6.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grafana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grafana

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 12.0.0 (Debian / Ubuntu)

apt-cache madison grafana sudo apt install grafana=<VERSION_BEFORE_12.0.0> sudo apt-mark hold grafana

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list grafana sudo dnf downgrade grafana-<VERSION_BEFORE_12.0.0> sudo dnf versionlock add grafana

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21727?

grafana: upgrade to 11.6.11, 12.0.9, 12.1.6, 12.2.4, 12.3.3. Exact commands for each OS are on this page.

Is CVE-2026-21727 being exploited?

CVE-2026-21727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21727 affect?

CVE-2026-21727 affects grafana. Severity is low (CVSS 3.3). A cross-tenant isolation vulnerability was found in Grafana’s Correlations feature affecting legacy correlation records. Due to a backward compatibility condition allowing org_id = 0 records to be returned across organizations, a user with

How urgent is CVE-2026-21727?

Priority 14/100. No elevated risk signals yet.

Software pages

Grafana vulnerabilities

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References

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